it says it there: " Disable removable media devices that might prevent a host from entering maintenance mode"
with YES if we install and update that requires reboot of a Host then the Host needs to go into maintenance mode, so that the VMs in it migrate to another Host. so Update will get installed, the Host will go into maintenance mode and then reboot, the VMs in it will migrate to another host
if the option is NO, then after the Update is installed on the Host, if reboot required, it will not happened since the removable media is not disabled.
with YES
if we install and update that requires reboot of a Host then the Host needs to go into maintenance mode, so that the VMs in it migrate to another Host. so Update will get installed, the Host will go into maintenance mode and then reboot, the VMs in it will migrate to another host
if the option is NO, then after the Update is installed on the Host, if reboot required, it will not happened since the removable media is not disabled.